Kings Tides and beach profile

At the same time as last weeks, transit of venus there was also a full moon and a very low atmospheric depression out to the east over the Tasman Sea.. Perfect conditions for a really high tide. I did check the beach on the 7th. and could only see the old erosion face from last year and the regrowth on the sand screen below them. There was a slight notch in several location that looked as if it could be more than a few days old but it was not very extensive (these are labeled in white in the above photo). I revisited the same areas south of beach one today and can see a fresh cut (only 5 to 20cm tall) but extending most of the way along the beach (labeled in yellow). Also the beach below the cut does seem to be “steeper”. So I suspect there has been some significant erosion/sand movement along the beach in the past week. So the picture that the erosion events are most likely to occur with the king tides (full moon) and atmospheric lows does have a little more circumstantial support.

Venus Bay Inspired Art

The Last Pipi Harvest at Venus Bay

Mixed Media on Canvas
102 by 102cm
By Norm Hanson 2012
This is a story of anthropogenic extinction, as written into future stone. The ochre coloured sandstone [1] was at one time a thriving beach, brimming with life and specifically a prolific population of Donax Deltiodes, also known as Pipis or Surf clams. However the Pipis were so yummy and they were harvested in such numbers that fewer and fewer shells reached maturity each year. Then suddenly in one season, the entire population failed to reproduce. Worse the rich food chain of the beautiful beach collapsed, with their demise, and the once thriving beach became a pale version of itself. Only a few brave worm burrows [2] could be found. Then all signs of life disappeared [3].

This story need not come true.


The work was created first as a mould of the main units in the sand south of Beach one. This included leaving some of the worm burrow/air holes undisturbed. broken Pipis and other shells where collected nearby and scattered in the mould. The mould was filled with expanding polyurethane foam and cover with the canvas, burried and left to harden for an hour or so. The foam on canvas mould was next painted with several coats of sand, gesso and latex to create an absorbent sandstone like finish. Finally this was “stained” and painted with various oxides. It represents a future geological rock face, perhaps a few million years into our future. This rock face runs close to the bedding planes with the oldest layers, the ochre sandstone on the lower left, closest to you. You are looking "up" in time.

This work will be on display at the Mount View Art Show, 14th - 17th June 2012

The Transit of Venus

Providing the skies are cloud free, Venus Bay will be a great place to observe the Transit of Venus. Remember you must not look directly at the sun SERIOUS EYE DAMAGE MAY RESULT.
The transits of Venus, they are like an eclipses, are very rare but when they occur there are two such events 8 years apart. During the transit Venus is positioned between us and the sun and casts a shadow. Unlike an eclipse of the moon this show is small and seen as a small dark dot as it moves across the face of the sun.
This is only the fifth transit since James Cook travelled to Tahitti in 1769 to make observation there. Astronomers back in England wanted to know exactly how long the transit took and from that they predicted they would be able to compute the distance of the earth and Venus from the sun. This trip is also famous because on the way back to England he reach Australia, called it New South Wales and claimed it for England.

When?

There are four key events in the transit

First touches the sun	8:18 AM
Just inside the Sun, ingress	8:34 AM
Just inside the Sun, egress	2:27 PM
Last Touches the Sun	2:45 PM

 

Where is the best place to observe?

Well really anywhere around Venus Bay you can see the sun at the times above. Remember the sun will be relatively low in the sky during the Ingress. So I might start my own observations just near lees Road and Jupiter avenue intersection, on the bike track as it comes off the little rise. There is a very clear view of the eastern sky from here. During the Egress the car park at Beach One is a good location as it has a good view of the north western sky.


The Venus Bay, Tarwin Lower Men’s Shed are having activities around observing the transit, weather permitting, including a sausage sizzle & live music from local artists. They will have a solar telescope for safe viewing of the transit, solar flares, sunspots and active regions of the sun. Gold Coin Donation. Check the May edition of Matter of Fact Newsletter for more details.

How to Observe?

I will be using the same method used by captain cook. I will project an image of the sun onto a screen using my telescope. I took the picture below of the transit in 2004 and I’m hoping I can do better this time.

The Sydney observatory has a great factsheet on the 6 June 2012 Transit of Venus. If you’d like more information of making observations yourself, it will even help you do the calculations of distance to the sun and Venus if you want to independently verify the astronomers work.

Sand in movement

Panoramic photo taken on Tuesday at Beach 1 showing some erosion occurring to the fore-dune. Notice the water pooling in the bottom right.

This next photo is facing SE at the same site and the undulating effect from the pooling water extends to the horizon.  Truly a dynamic environment!

Bad weather for Sailors, but good for Diatoms

Beach One was the location of a mass stranding of Velella lata, more commonly known as by-the-wind-sailors. These little blue creatures are no more than 5cm long and are related to jellyfishes and anemones. Their natural habitat is on the surface of the open ocean, where the Velella feed on plankton.



They move across the ocean with their distinctive transparent "sail" catching the wind, visible in this first picture.

Every now and again a change of wind direction (like the cold blast we are currently experiencing) blows thousands of Velella helplessly towards the shore.
This second picture shows the underside of the Velella where its feeding tentacles are visible.


The same sort of weather that was responsible for the stranding of the Velella brought waters rich in nutrients that has allowed the Diatoms to bloom along the surf of Beach One.

This picture taken this morning at Beach One showing the characteristic browny-green "stain" of a Diatom bloom.